Which contestant has improved the most?

Hello everyone! :)

I think that SaReGaMaPa's main purpose as a show is to give a good platform to talented people and help them succeed in the music industry. Recently, it has also assumed the objective of helping to train the singers as well.

I don't know about you, but whenever there used to be a series on the show, I would look up the winners, and try and see if they really got any breaks. Unfortunately, I realized that despite there existing so much talent in this country, there are really only a few people that recieve that break, and even fewer who have staying power, and manage to stay in the industry for a long time.

It seems obvious that those who make it there and are able to stay are the hardest working ones. And I think that we can judge who is the hardest working contestant by observing who has improved the most in their singing, performing, or the whole package!

Of course, this may also give us an insight into which mentor has been helping the most as well. So, any thoughts?